Gaya APA
Service, P, E., Contra, I, A, O, D. (1981).
Lessons in rotary drilling. Unit I Lesson 10. safety on rthe rig. (1981).
:
Texas : Petroleum Extension Service,.
Gaya MLA
Service, Petroleum, Extension., Contra, Inter., Ass., Of, Drilling.
"Lessons in rotary drilling. Unit I Lesson 10. safety on rthe rig.".
1981
:
Texas : Petroleum Extension Service,,
1981.
Text.